src/video/nds/SDL_ndsvideo.c
author Darren Alton <dalton@stevens.edu>
Thu, 12 Jun 2008 02:38:49 +0000
branchgsoc2008_nds
changeset 2671 c3e7c0698cbb
parent 2670 6e4669f4db49
child 2672 74ac057679d5
permissions -rw-r--r--
some changes to the dummy driver for debug purposes that should be reverted.
most importantly, commenting out a check for an env. var.
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2006 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#include "SDL_config.h"
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/* Dummy SDL video driver implementation; this is just enough to make an
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 *  SDL-based application THINK it's got a working video driver, for
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 *  applications that call SDL_Init(SDL_INIT_VIDEO) when they don't need it,
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 *  and also for use as a collection of stubs when porting SDL to a new
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 *  platform for which you haven't yet written a valid video driver.
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 *
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 * This is also a great way to determine bottlenecks: if you think that SDL
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 *  is a performance problem for a given platform, enable this driver, and
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 *  then see if your application runs faster without video overhead.
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 *
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 * Initial work by Ryan C. Gordon (icculus@icculus.org). A good portion
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 *  of this was cut-and-pasted from Stephane Peter's work in the AAlib
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 *  SDL video driver.  Renamed to "DUMMY" by Sam Lantinga.
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <nds.h>
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#include "SDL_video.h"
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#include "SDL_mouse.h"
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#include "../SDL_sysvideo.h"
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#include "../SDL_pixels_c.h"
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#include "../../events/SDL_events_c.h"
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#include "SDL_ndsvideo.h"
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#include "SDL_ndsevents_c.h"
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#include "SDL_ndsrender_c.h"
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#define NDSVID_DRIVER_NAME "nds"
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/* Initialization/Query functions */
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static int NDS_VideoInit(_THIS);
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static int NDS_SetDisplayMode(_THIS, SDL_DisplayMode * mode);
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static void NDS_VideoQuit(_THIS);
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/* DUMMY driver bootstrap functions */
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static int
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NDS_Available(void)
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{
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    const char *envr = SDL_getenv("SDL_VIDEODRIVER");
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    printf("NDS_Available()\n");
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    return (1);
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}
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static void
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NDS_DeleteDevice(SDL_VideoDevice * device)
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{
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    SDL_free(device);
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}
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static SDL_VideoDevice *
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NDS_CreateDevice(int devindex)
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{
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    SDL_VideoDevice *device;
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    printf("NDS_CreateDevice(%d)\n", devindex);
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    /* Initialize all variables that we clean on shutdown */
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    device = (SDL_VideoDevice *) SDL_calloc(1, sizeof(SDL_VideoDevice));
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    if (!device) {
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        SDL_OutOfMemory();
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        if (device) {
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            SDL_free(device);
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        }
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        return (0);
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    }
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    /* Set the function pointers */
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    device->VideoInit = NDS_VideoInit;
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    device->VideoQuit = NDS_VideoQuit;
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    device->SetDisplayMode = NDS_SetDisplayMode;
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    device->PumpEvents = NDS_PumpEvents;
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    device->num_displays = 2;   /* DS = dual screens */
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    device->free = NDS_DeleteDevice;
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    return device;
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}
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VideoBootStrap NDS_bootstrap = {
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    NDSVID_DRIVER_NAME, "SDL NDS video driver",
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    NDS_Available, NDS_CreateDevice
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};
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int
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NDS_VideoInit(_THIS)
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{
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    SDL_DisplayMode mode;
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    int i;
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    /* simple 256x192x16x60 for now */
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    mode.w = 256;
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    mode.h = 192;
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    mode.format = SDL_PIXELFORMAT_ARGB1555;
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    mode.refresh_rate = 60;
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    mode.driverdata = NULL;
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    SDL_AddBasicVideoDisplay(&mode);
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    SDL_AddRenderDriver(0, &SDL_NDS_RenderDriver);
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    SDL_zero(mode);
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    SDL_AddDisplayMode(0, &mode);
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    /* hackish stuff to get things up and running for now, and for a console */
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    powerON(POWER_ALL);
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    videoSetMode(MODE_FB0);
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    videoSetModeSub(MODE_0_2D | DISPLAY_BG0_ACTIVE);    /* debug text on sub */
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    vramSetBankA(VRAM_A_LCD);
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    vramSetBankC(VRAM_C_SUB_BG);
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    irqInit();
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    irqEnable(IRQ_VBLANK);
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    /* set up console for debug text 'n stuff */
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    SUB_BG0_CR = BG_MAP_BASE(31);
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    BG_PALETTE_SUB[255] = RGB15(31, 31, 31);
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    consoleInitDefault((u16 *) SCREEN_BASE_BLOCK_SUB(31),
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                       (u16 *) CHAR_BASE_BLOCK_SUB(0), 16);
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    for (i = 0; i < 256 * 192; ++i) {
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        ((u16 *) VRAM_A)[i] = i;
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    }
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    for (i = 0; i < 60; ++i)
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        swiWaitForVBlank();
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    /*NDS_SetDisplayMode(_this, &mode); */
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    return 0;
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}
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static int
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NDS_SetDisplayMode(_THIS, SDL_DisplayMode * mode)
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{
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    /* right now this function is just hard-coded for 256x192 ARGB1555 */
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#if 0
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    videoSetMode(MODE_5_2D | DISPLAY_BG3_ACTIVE);       /* display on main core */
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    videoSetModeSub(MODE_0_2D | DISPLAY_BG0_ACTIVE);    /* debug text on sub */
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    vramSetMainBanks(VRAM_A_MAIN_BG_0x06000000, VRAM_B_LCD,
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                     VRAM_C_SUB_BG, VRAM_D_LCD);
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    /* maps well to the 256x192 screen anyway.  note: need VRAM_B for bigger */
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    BG3_CR = BG_BMP16_256x256;
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    /* affine transformation matrix.  nothing too fancy here */
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    BG3_XDX = 0x100;
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    BG3_XDY = 0;
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    BG3_YDX = 0;
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    BG3_YDY = 0x100;
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    /* x/y position */
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    BG3_CX = 0;
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    BG3_CY = 0;
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#endif
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    return 0;
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}
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void
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NDS_VideoQuit(_THIS)
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{
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}
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/* vi: set ts=4 sw=4 expandtab: */